191021-97-3Relevant academic research and scientific papers
Ru(II) complexes with the ligand 1,2-ds(diphenylphosphino)ethylene: Chemical and electrochemical synthesis, characterization and x-ray structure
Batista, Alzir A.,Cordeiro, Luiz Acácio C.,Oliva, Glaucius,Nascimento, Otaciro R.
, p. 131 - 137 (1997)
The synthesis of [RuL1L2(dppen)2], where L1 = L2 = Cl (I); L1 = H, L2 = Cl (II); [HRuCO(dppen)2] (PF6) (III), is described. The cis- and trans-[RuCl2(dppen)2] (dppen = 1,2-cis(diphenylphosphino)ethylene) isomers have been chemically synthesized using the [RuCl2(PPh3)3] precursor. Furthermore, these isomers were obtained by exhaustive controlled potential coulometry, starting from the trans-hydride [HRuCl(dppen)2] complex in dichloromethane. The trans-[RuCl2(dppen)2] species can also be obtained by electrochemical transformation from the cis isomer, with the oxidized intermediate trans-[RuCl2(dppen)2]+ detected by EPR measurements and cyclic voltammetry. All complexes herein described were fully characterized by spectroscopic techniques. Crystals of trans-[RuCl2(dppen)2] were obtained from dichloromethane/hexane and its X-ray structure determined. The crystals belong to the monoclinic space group P21/c, a = 11.480(2), b = 13.061(2), c = 17.500(3) ?, β = 95.28(1)°, and the structure was solved by conventional heavy atom methods and refined by full-matrix least-squares procedures to R = 0.059 from 2720 reflections with 1 ≥ 3σ(I).
